83C576 Philips Semiconductors, 83C576 Datasheet - Page 34

• Manufacturer Part Number: 83C576
• Description: 80C51 8-bit microcontroller family 8K/256 OTP/ROM/ 6 channel 10-bit A/D/ 4 comparators/ failure detect circuitry/ watchdog timer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
UPI AC ELECTRICAL CHARACTERISTICS
T
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has five characters. The first character is always
‘t’ (= time). The other characters, depending on their positions,
indicate the name of a signal or the logical status of that signal.
The designations are:
A – Address
C – Clock
D – Input data
H – Logic level high
I – Instruction (program memory contents)
L – Logic level low, or ALE
1998 Jun 04
amb
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
AR
RA
RR
AD
RD
DF
AW
WA
WW
DW
WD
80C51 8-bit microcontroller family
8K/256 OTP/ROM, 6 channel 10-bit A/D, 4 comparators,
failure detect circuitry, watchdog timer
= 0 C to +70 C, –40 C to +85 C, and –40 C to +125 C; V
PORT 0
PORT 2
PSEN
ALE
CS, A setup to RD
CS, A hold after RD
RD pulse width
CS, A to data out delay
RD to data out delay
RD to data float delay (guaranteed by design)
CS, A setup to WR
CS, A hold after WR
WR pulse width
Data setup to WR
Data hold after WR
t
LHLL
t
AVLL
PARAMETER
A0–A7
Figure 25. External Program Memory Read Cycle
t
t
t
AVIV
LLAX
LLPL
t
LLIV
t
PLIV
A0–A15
t
PLAZ
t
PLPH
CC
= 5V 10%, V
t
PXIX
INSTR IN
34
P – PSEN
Q – Output data
R – RD signal
t – Time
V – Valid
W – WR signal
X – No longer a valid logic level
Z – Float
Examples: t
t
SS
PXIZ
= 0V
t
AVLL
LLPL
= Time for address valid to ALE low.
=Time for ALE low to PSEN low.
MIN
35
35
15
45
25
0
0
5
A0–A7
A8–A15
83C576/87C576
MAX
45
35
30
Product specification
SU00006
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns